Photo response of 164Dy

Papst, O.; Werner, V.; Isaak, J.; Pietralla, N.; Beck, T.; Bernards, C.; Bhike, M.; Cooper, N.; Crider, B. P.; Friman-Gayer, U.; Kleemann, J.; Krishichayan, None; Löher, B.; Naqvi, F.; Peters, E. E.; Prados-Estévez, F. M.; Ilieva, R. S.; Ross, T. J.; Savran, D.; Tornow, W.; Vanhoy, J. R.

doi:10.1103/physrevc.102.034323

Title: Photo response of ¹⁶⁴Dy

Journal Article · Mon Sep 21 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.034323· OSTI ID:1800746

^[1]; Werner, V. ^[2]; Isaak, J. ^[1]; Pietralla, N. ^[1]; Beck, T. ^[1]; Bernards, C. ^[3]; Bhike, M. ^[4]; Cooper, N. ^[3]; Crider, B. P. ^[5]; Friman-Gayer, U. ^[1]; Kleemann, J. ^[1]; Krishichayan, None ^[4]; Löher, B. ^[6]; Naqvi, F. ^[3]; Peters, E. E. ^[5]; Prados-Estévez, F. M. ^[5]; Ilieva, R. S. ^[7]; Ross, T. J. ^[5]; Savran, D. ^[6]; Tornow, W. ^[4] more »

Technische Univ. Darmstadt (Germany)
Technische Univ. Darmstadt (Germany); Yale Univ., New Haven, CT (United States)
Yale Univ., New Haven, CT (United States)
Duke Univ., Durham, NC (United States)
Univ. of Kentucky, Lexington, KY (United States)
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany)
Yale Univ., New Haven, CT (United States); Univ. of Surrey, Guildford (United Kingdom)
United States Naval Academy, Annapolis, MD (United States)

Background: Little data is available for the pygmy dipole resonance (PDR) in axially deformed nuclei. Photon-scattering experiments are complicated by high level densities in the PDR region and the small energy difference of transitions to the ground state and to excited states. Purpose: In this work, we report on an experimental study of the low-energy dipole strength distribution of the well-deformed nucleus ¹⁶⁴Dy between 4.0–7.7 MeV. Methods: The low-lying photoresponse of ¹⁶⁴Dy has been investigated using the method of nuclear resonance fluorescence using a quasimonochromatic linearly polarized $$\textit{γ}$$-ray beam in the energy range of 4.0–7.7 MeV in steps of 0.2 MeV. Results: For excitation energies between 4 MeV and 5 MeV, sufficiently low level densities allow for the identification of individual states, including level energies, reduced transition widths and branching ratios. Energy-averaged mean decay branching ratios, mean population ratios and partial absorption cross sections were determined above 5 MeV up to the neutron-separation threshold at 7.7 MeV. A Lorentzian-shaped enhancement of the partial photo absorption cross section followed by decays back to the ground-state band is found at 6.10(5) MeV with a width of 0.77(23) MeV. A comparison with results from complementary measurements is performed using the framework of the statistical model. Conclusions: The experimental results for the mean population ratios deviate systematically from the statistical model simulation by 30(6)%. However, they are in agreement within one standard deviation of the simulation.

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Research Organization:: Yale Univ., New Haven, CT (United States); Duke Univ., Durham, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC); German Research Foundation (DFG); State of Hesse; Federal Ministry of Education and Research (BMBF); Helmholtz Association

Grant/Contract Number:: FG02-91ER40609; FG02-97ER41033; 05P18RDEN9

OSTI ID:: 1800746

Journal Information:: Physical Review C, Vol. 102, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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